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# Electrical Principles Jim Jenneson 7th Edition- Test Bank

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Electrical Principles Jim Jenneson 7th Edition- Test Bank

Sample Questions

Chapter 08

Testbank

Multiple Choice Questions

1. The type of units of measurement, mathematical processes and simple mechanics used by electricians is:

 A. metric Standard International units

 B. British imperial units

 C. American imperial units

 D. furlong/firkin/fortnight units

2. Base units are not formed from other units, although the SI system defines them as having specific dimensions which are derived from:

 A. time constants

 B. mechanical constants

 C. physical constants

 D. torque constants

3. The maths used by electricians works with:

 A. base units and the integral units

 B. base units and the large units

 C. base units and the small units

 D. base units and the derived units

4. The length of a prototype platinum bar stored in France at standard temperature and pressure, is exactly:

 A. 1.5 m long

 B. 1.1 m long

 C. 1 m long

 D. 2 m long

5. Weight is the force caused by:

 A. the force of the body

 B. the mass of the body

 C. the speed of the body

 D. the torque of the body

6. Candela (cd) is defined as:

 A. the luminous efficiency in a given direction of a source

 B. the luminous density in a given direction of a source

 C. the luminous flux in a given direction of a source

 D. the luminous intensity in a given direction of a source

 A. 360° divided by 2π or ~57.3°

 B. 300° divided by 3π or ~56.3°

 C. 320° divided by 2π or ~59.3°

 D. 380° divided by 4π or ~58.3°

8. Time is now synchronised to:

 A. physical clocks around the world

 B. Russian clocks around the world

 C. atomic clocks around the world

 D. American clocks around the world

9. Which unit is used in defining the radiation of light and other radiating quantities?

 A. Luminance—the candela

 D. None of the given answers is correct

10. There are many more derived units described in:

 A. AS/NZS ISO 9000

 B. AS/NZS ISO 1000

 C. AS/NZS ISO 2000

 D. AS/NZS ISO 1001

11. A coulomb is the quantity of electric charge that is nominally equal to:

 A. 6.42 × 1018

 B. 6.24 × 1018

 C. 6.14 × 1018

 D. 6.23 × 1018

12. A newton (N) is the force which causes an acceleration of 1 metre per second when applied to:

 A. a weight of 1 kg

 B. a mass of 1 g

 C. a mass of 1 kg

 D. a weight of 1 g

13. A force of 1 newton applied to an area of 1 square metre is the:

 A. pressure

 B. torque

 C. energy

 D. power

14. When a force of 1 newton is applied to a mass, causing it to move a distance of 1 metre:

 A. the work done (or energy saved) is 1 kW (kilowatt)

 B. the work done (or energy expended) is 1 W (watt)

 C. the work done (or energy saved) is 1 J (joule)

 D. the work done (or energy expended) is 1 J (joule)

15. The power used when energy is expended at the rate of 1 J per second is:

 A. a watt

 B. a newton

 C. a kelvin

 D. a meter

16. A hertz (Hz) is the number of periodic:

 A. oscillations per minute

 B. oscillations per hour

 C. oscillations per second

 D. oscillations per micro second

17. The weber (Wb) was once defined as:

 A. a unit of 180 lines of force

 B. a unit of 118 lines of force

 C. a unit of 18 lines of force

 D. a unit of 108 lines of force

18. The magnetic flux density of 1 weber per square metre is:

 A. 1 Newton

 B. 1 Tesla

 C. 1 Henry

19. The magnitude of the number is converted into an exponent, and the value of the number is expressed with:

 A. two digits before a decimal place

 B. five digits before a decimal place

 C. one digit before a decimal place

 D. three digits before a decimal place

20. one giga (G) is equal to:

 A. 106

 B. 1012

 C. 109

 D. 103

21. Transposition is used when the maths is:

 A. Algebra

 B. Differential calculus

 C. Integral

 D. None of the given answers is correct

22. Work can also be described as the process of converting:

 A. molecules from one form into another

 B. energy from one form into another

 C. power from one form into another

 D. work from one form into another

23. A force of 100 N is required to move a box 3 m along a horizontal surface. Find the value of work done.

 A. 33.3 J

 B. 103 J

 C. 300 J

 D. 97 J

24. In mechanical machines where the movement is of a rotational type, the distance covered depends on the:

 B. radius as well as the speed of rotation

 C. the speed of rotation

 D. None of the given answers is correct

25. Power is calculated directly from:

 A. the constant speed (n) multiplied by the number of radians in a circle (2π) and torque (T)

 B. the rotational speed (n) divided by the number of radians in a circle (2π) and torque (T)

 C. the constant speed (n) divided by the number of radians in a circle (2π) and torque (T)

 D. the rotational speed (n) multiplied by the number of radians in a circle (2π) and torque (T)

26. Rotational speed is often given as:

 C. rpm (r/min) rather than rad.s−1

 D. rph (r/hour) rather than rad.s−1

27. A force of 150 N is applied to the end of a spanner 0.4 m long to tighten a nut. Calculate the torque applied to the nut:

 A. 65 Nm

 B. 60 Nm

 C. 70 Nm

 D. 39.9 Nm

28. Find the torque exerted by a 3kW electric motor operating at 1440 rpm.

 A. 20.46 Nm

 B. 19.5 Nm

 C. 20 Nm

 D. 18.6 Nm

29. If a device has a power input of 160 W and a power output of 120 W, find the efficiency and the loss (W).

 A. 73%, 30 W

 B. 74%, 45 W

 C. 75%, 40 W

 D. 72%, 35 W

30. Find the efficiency of the electric motor in Question No. 27 if the losses are found to be 357 W.

 A. 88.4%

 B. 86.3%

 C. 89.4%

 D. 87.5%

31. The terms ‘scalar’ and ‘vector’ are used when thinking of mechanical quantities, but:

 A. these quantities also occur in chemical theory

 B. these quantities also occur in electrical theory

 C. these quantities also occur in newton theory

 D. these quantities also occur in mathematical theory

32. The quantities which have magnitude but no direction are called:

 A. vector quantities

 B. volume quantities

 C. scalar quantities

 D. None of the given answers are correct

33. The quantities which must be expressed in both magnitude and direction are called:

 A. vector quantities

 B. volume quantities

 C. scalar quantities

 D. None of the given answers are correct

34. Vectors, when applied to electrical systems, are called:

 A. angles

 C. phasors

 D. degrees

35. Scalar quantities may be drawn as a:

 A. parabola proportional to their magnitude

 B. straight line proportional to their magnitude

 C. elliptical proportional to their magnitude

 D. straight line inversely proportional to their magnitude

36. Vector quantities acting in the same direction can also be treated as:

 A. scalar quantities

 B. mass quantities

 C. volume quantities

 D. pressure quantities

37. The unit ‘kilogram’ is used to measure:

 A. liquid

 B. length

 C. mass

 D. torque

38. The resultant value of two forces acting on a body depends on the:

 A. torque between the directions of the forces, as well as their respective magnitudes

 B. angle between the directions of the forces, as well as their respective magnitudes

 C. angle between the directions of the torque, as well as their respective magnitudes

 D. angle between the directions of the speed, as well as their respective magnitudes

39. The forces are in opposition and the resultant force is F1 − F2 which will act in the direction of:

 A. the larger force

 B. the lesser force

 C. the medium force

 D. average force

40. Two forces (F1 and F2), each of 25 N, act at right angles to each other on a body. Determine the value of the resultant force (FR) acting on the body.

 A. 0.3335 N

 B. 333.5 N

 C. 33.35 N

 D. 3.335 N

41. In which method are the two forces drawn to scale from a point of application in the direction of application?

 A. The vector polygon method

 B. The parallelogram method

 C. The polar method

 D. The vector method

42. Which method is also known as the ‘graphical’ or ‘vector diagram method’?

 A. The vector polygon method

 B. The polar method

 C. The vector method

 D. The parallelogram method

43. Which method requires each vector to be drawn to scale and angle with its origin at the end of the previous vector?

 A. The vector polygon method

 B. The parallelogram method

 C. The polar method

 D. The vector method

44. A vector has magnitude and direction (angle) and is usually written in:

 A. rectangular form

 B. polar form

 C. laplace form

 D. graphical form

45. Once the sum of the horizontal and vertical forces is known, they can be combined using:

 A. superposition theorem

 B. Newton’s theorem

 C. Norton’s theorem

 D. Pythagoras’ theorem

46. Trigonometry is based on the measurements of:

 A. rectangles

 B. circles

 C. triangles

 D. square

47. Which triangle has different sizes and have different lengths of sides, but the angles remain constant?

 A. Right angle triangle

 B. Left angle triangle

 C. Symmetrical triangle

 D. Asymmetrical triangle

48. In any right angle triangle, hypotenuse is the:

 A. shortest side

 B. longest side

 C. opposite side

49. In any right angle triangle, the side nearest a given angle is called the:

 A. hypotenuse

 C. opposite side

 D. None of the given answers are correct

50. In any right angle triangle, the side furthest from a given angle is called the:

 A. hypotenuse

 C. opposite side

 D. None of the given answers are correct

Multiple Choice Questions

1. The type of units of measurement, mathematical processes and simple mechanics used by electricians is:

 A. metric Standard International units

 B. British imperial units

 C. American imperial units

 D. furlong/firkin/fortnight units

 Section: 8.0 Introduction

2. Base units are not formed from other units, although the SI system defines them as having specific dimensions which are derived from:

 A. time constants

 B. mechanical constants

 C. physical constants

 D. torque constants

 Section: 8.2 SI units

3. The maths used by electricians works with:

 A. base units and the integral units

 B. base units and the large units

 C. base units and the small units

 D. base units and the derived units

 Section: 8.2 SI units

4. The length of a prototype platinum bar stored in France at standard temperature and pressure, is exactly:

 A. 1.5 m long

 B. 1.1 m long

 C. 1 m long

 D. 2 m long

 Section: 8.2 SI units

5. Weight is the force caused by:

 A. the force of the body

 B. the mass of the body

 C. the speed of the body

 D. the torque of the body

 Section: 8.2 SI units

6. Candela (cd) is defined as:

 A. the luminous efficiency in a given direction of a source

 B. the luminous density in a given direction of a source

 C. the luminous flux in a given direction of a source

 D. the luminous intensity in a given direction of a source

 Section: 8.2 SI units

 A. 360° divided by 2π or ~57.3°

 B. 300° divided by 3π or ~56.3°

 C. 320° divided by 2π or ~59.3°

 D. 380° divided by 4π or ~58.3°

 Section: 8.2 SI units

8. Time is now synchronised to:

 A. physical clocks around the world

 B. Russian clocks around the world

 C. atomic clocks around the world

 D. American clocks around the world

 Section: 8.2 SI units

9. Which unit is used in defining the radiation of light and other radiating quantities?

 A. Luminance—the candela

 D. None of the given answers is correct

 Section: 8.2 SI units

10. There are many more derived units described in:

 A. AS/NZS ISO 9000

 B. AS/NZS ISO 1000

 C. AS/NZS ISO 2000

 D. AS/NZS ISO 1001

 Section: 8.2 SI units

11. A coulomb is the quantity of electric charge that is nominally equal to:

 A. 6.42 × 1018

 B. 6.24 × 1018

 C. 6.14 × 1018

 D. 6.23 × 1018

 Section: 8.3 SI derived units

12. A newton (N) is the force which causes an acceleration of 1 metre per second when applied to:

 A. a weight of 1 kg

 B. a mass of 1 g

 C. a mass of 1 kg

 D. a weight of 1 g

 Section: 8.3 SI derived units

13. A force of 1 newton applied to an area of 1 square metre is the:

 A. pressure

 B. torque

 C. energy

 D. power

 Section: 8.3 SI derived units

14. When a force of 1 newton is applied to a mass, causing it to move a distance of 1 metre:

 A. the work done (or energy saved) is 1 kW (kilowatt)

 B. the work done (or energy expended) is 1 W (watt)

 C. the work done (or energy saved) is 1 J (joule)

 D. the work done (or energy expended) is 1 J (joule)

 Section: 8.3 SI derived units

15. The power used when energy is expended at the rate of 1 J per second is:

 A. a watt

 B. a newton

 C. a kelvin

 D. a meter

 Section: 8.3 SI derived units

16. A hertz (Hz) is the number of periodic:

 A. oscillations per minute

 B. oscillations per hour

 C. oscillations per second

 D. oscillations per micro second

 Section: 8.3 SI derived units

17. The weber (Wb) was once defined as:

 A. a unit of 180 lines of force

 B. a unit of 118 lines of force

 C. a unit of 18 lines of force

 D. a unit of 108 lines of force

 Section: 8.3 SI derived units

18. The magnetic flux density of 1 weber per square metre is:

 A. 1 Newton

 B. 1 Tesla

 C. 1 Henry

 Section: 8.3 SI derived units

19. The magnitude of the number is converted into an exponent, and the value of the number is expressed with:

 A. two digits before a decimal place

 B. five digits before a decimal place

 C. one digit before a decimal place

 D. three digits before a decimal place

 Section: 8.3 SI derived units

20. one giga (G) is equal to:

 A. 106

 B. 1012

 C. 109

 D. 103

 Section: 8.3 SI derived units

21. Transposition is used when the maths is:

 A. Algebra

 B. Differential calculus

 C. Integral

 D. None of the given answers is correct

 Section: 8.4 Transposition

22. Work can also be described as the process of converting:

 A. molecules from one form into another

 B. energy from one form into another

 C. power from one form into another

 D. work from one form into another

 Section: 8.5 Energy, work and power

23. A force of 100 N is required to move a box 3 m along a horizontal surface. Find the value of work done.

 A. 33.3 J

 B. 103 J

 C. 300 J

 D. 97 J

 Section: 8.5 Energy, work and power

24. In mechanical machines where the movement is of a rotational type, the distance covered depends on the:

 B. radius as well as the speed of rotation

 C. the speed of rotation

 D. None of the given answers is correct

 Section: 8.5 Energy, work and power

25. Power is calculated directly from:

 A. the constant speed (n) multiplied by the number of radians in a circle (2π) and torque (T)

 B. the rotational speed (n) divided by the number of radians in a circle (2π) and torque (T)

 C. the constant speed (n) divided by the number of radians in a circle (2π) and torque (T)

 D. the rotational speed (n) multiplied by the number of radians in a circle (2π) and torque (T)

 Section: 8.5 Energy, work and power

26. Rotational speed is often given as:

 C. rpm (r/min) rather than rad.s−1

 D. rph (r/hour) rather than rad.s−1

 Section: 8.5 Energy, work and power

27. A force of 150 N is applied to the end of a spanner 0.4 m long to tighten a nut. Calculate the torque applied to the nut:

 A. 65 Nm

 B. 60 Nm

 C. 70 Nm

 D. 39.9 Nm

 Section: 8.5 Energy, work and power

28. Find the torque exerted by a 3kW electric motor operating at 1440 rpm.

 A. 20.46 Nm

 B. 19.5 Nm

 C. 20 Nm

 D. 18.6 Nm

 Section: 8.5 Energy, work and power

29. If a device has a power input of 160 W and a power output of 120 W, find the efficiency and the loss (W).

 A. 73%, 30 W

 B. 74%, 45 W

 C. 75%, 40 W

 D. 72%, 35 W

 Section: 8.5 Energy, work and power

30. Find the efficiency of the electric motor in Question No. 27 if the losses are found to be 357 W.

 A. 88.4%

 B. 86.3%

 C. 89.4%

 D. 87.5%

 Section: 8.5 Energy, work and power

31. The terms ‘scalar’ and ‘vector’ are used when thinking of mechanical quantities, but:

 A. these quantities also occur in chemical theory

 B. these quantities also occur in electrical theory

 C. these quantities also occur in newton theory

 D. these quantities also occur in mathematical theory

 Section: 8.6 Scalar and vector quantities

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